Biondi F
Department of Geography, University of Nevada, Mail Stop 154, Reno, NV 89557, USA.
Ambio. 2001 May;30(3):162-6. doi: 10.1579/0044-7447-30.3.162.
High-elevation sites in the tropics may be particularly sensitive to rapid climate change. By sampling treeline populations, I have developed the first extensive (> 300 years) tree-ring chronology in tropical North America. The site is Nevado de Colima, at the western end of the Mexican Neovolcanic Belt, and the species studied is Mexican mountain pine (Pinus hartwegii). Despite past logging in the area, 300 to 500-year old pines were found at 3600-3700 m elevation, about 300 m below the present treeline. The Nevado de Colima tree-ring chronology is well replicated from 1600 to 1997. Calibration with Colima climatic records points to summer monsoon precipitation as the strongest dendroclimatic signal. Most trees also exhibit extremely low growth in 1913 and 1914, following the January 1913 Plinian eruption of the Volcan de Colima. Because P. hartwegii is found on top of high mountains from Mexico to Guatemala, there is potential for developing a network of tropical treeline chronologies.
热带地区的高海拔地点可能对快速的气候变化尤为敏感。通过对树线种群进行采样，我编制了北美热带地区首个广泛的（超过300年）树木年轮年表。该地点是位于墨西哥新火山带西端的科利马火山，所研究的物种是墨西哥山松（Pinus hartwegii）。尽管该地区过去有过采伐活动，但在海拔3600 - 3700米处发现了树龄为300至500年的松树，比当前树线低约300米。科利马火山的树木年轮年表在1600年至1997年期间具有良好的重复性。与科利马气候记录进行校准后表明，夏季季风降水是最强的树木气候信号。在1913年1月科利马火山爆发后，大多数树木在1913年和1914年也呈现出极低的生长量。由于墨西哥山松生长在从墨西哥到危地马拉的高山顶部，因此有潜力建立一个热带树线年表网络。
